add missing export for hasContext (#5727)

Author: tanhauhau

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Svelte changelog
 
+## Unreleased
+
+* Actually export `hasContext` ([#5726](https://github.com/sveltejs/svelte/issues/5726))
+
 ## 3.30.0
 
 * Add a typed `SvelteComponent` interface ([#5431](https://github.com/sveltejs/svelte/pull/5431))

src/runtime/index.ts

@@ -7,6 +7,7 @@ export {
 	afterUpdate,
 	setContext,
 	getContext,
+	hasContext,
 	tick,
 	createEventDispatcher,
 	SvelteComponentDev as SvelteComponent

test/runtime/samples/context-api-c/Leaf.svelte

@@ -0,0 +1,7 @@
+<script>
+	import { hasContext } from 'svelte';
+
+	const has = hasContext('test');
+</script>
+
+<div>{has}</div>

test/runtime/samples/context-api-c/Nested.svelte

@@ -0,0 +1,11 @@
+<script>
+	import { setContext } from 'svelte';
+
+	export let value = '';
+
+	if (value) {
+		setContext('test', value);
+	}
+</script>
+
+<slot></slot>

test/runtime/samples/context-api-c/_config.js

@@ -0,0 +1,6 @@
+export default {
+	html: `
+		<div>true</div>
+		<div>false</div>
+	`
+};

test/runtime/samples/context-api-c/main.svelte

@@ -0,0 +1,12 @@
+<script>
+  import Nested from "./Nested.svelte";
+  import Leaf from "./Leaf.svelte";
+</script>
+
+<Nested value="bar">
+  <Leaf />
+</Nested>
+
+<Nested>
+  <Leaf />
+</Nested>